Touch Display Driving Circuit

1. A touch display driving circuit, comprising: a gate driving circuit, generating a plurality of scan signals; a source driving circuit, generating a plurality of source signals; a touch detection circuit, generating a driving signal and detecting a plurality of sensing signals in a touch detection period; one or more gate current-source, coupled to said gate driving circuit, and outputting one or more current signal according to the levels of said plurality of scan signals in said touch detection period for maintaining the average value of the level of said plurality of scan signals at a predetermined level; and a voltage supply circuit, producing a first voltage and a second voltage in a display period, and said first voltage lower than said second voltage, said gate driving circuit generating said plurality of scan signals according to said first voltage and said second voltage; wherein while said one or more gate current-source is outputting said one or more current signal according to the levels of said plurality of scan signals, the output impedance of said one or more gate current-source is huge to increase the impedance of the electrical path transmitting said plurality of scan signals.

2. The touch display driving circuit of claim 1, wherein said one or more gate current-source includes a first current-source; said first current-source outputs a first current signal for adjusting the level of a first input voltage received by said gate driving circuit to a predetermined cutoff voltage in said touch detection period for controlling the average value of the level of said first input voltage received by said gate driving circuit to said predetermined cutoff voltage; and the levels of said plurality of scan signals are controlled at a cutoff level according to said predetermined cutoff voltage.

3. The touch display driving circuit of claim 1 or 2, wherein said one or more gate current-source further includes a second current-source; said second current-source outputs a second current signal in said touch detection period for controlling the average value of the level of a second input voltage received by said gate driving circuit to a predetermined scan voltage; and said gate driving circuit maintains the levels of said plurality of scan signals at a scan level according to said predetermined scan voltage.

4. The touch display driving circuit of claim 3, and further comprising a source current-source, coupled to a plurality of source lines, outputting a source current signal in said touch detection period for providing a predetermined source voltage to said plurality of source lines, and said predetermined source voltage maintaining the average value of the levels of said plurality of source signals of said plurality of source lines at another predetermined level.

5. The touch display driving circuit of claim 1, and further comprising a source current-source, coupled to a plurality of source lines, outputting a source current signal in said touch detection period for providing a predetermined source voltage to said plurality of source lines, and said predetermined source voltage maintaining the average value of the levels of said plurality of source signals of said plurality of source lines at another predetermined level.

6. The touch display driving circuit of claim 5, and further comprising a switching circuit, coupled between said source current-source and said plurality of source lines, and said source current-source providing said predetermined source voltage to said plurality of source lines via said switching circuit in said touch detection period.

7. The touch display driving circuit of claim 1, and further comprising: a switching circuit, coupled between said voltage supply circuit and said gate driving circuit; where said voltage supply circuit provides said first voltage or/and said second voltage to said gate driving circuit via said switching circuit in said display period; and in said touch detection period, said switching circuit opens a conduction path between said voltage supply circuit and said gate driving circuit, and said one or more gate current-source outputs said one or more current signal for maintaining the average value of the levels of said plurality of scan signals at said predetermined level.

8. The touch display driving circuit of claim 1, wherein said gate current-source includes: a low-pass filter circuit, coupled to said gate driving circuit, and generating a control signal according to the level of said scan signal; and a switch, coupled to said low-pass filter circuit and coupled to a voltage, said control signal controlling the conduction state of said switch, and said current signal generated according to the conduction state of said switch and said voltage.

9. A touch display driving circuit, comprising: a gate driving circuit, generating a plurality of scan signals, and providing said plurality of scan signals to a plurality of scan lines; a source driving circuit, generating a plurality of source signals in a display period, and providing said plurality of source signals to a plurality of source lines; a touch detection circuit, generating a driving signal and detecting a plurality of sensing signals in a touch detection period; a source current-source, coupled to said plurality of source lines, and outputting a source current signal according to the levels of said plurality of source signals of said plurality of source lines in said touch detection period for maintaining the average value of the level of said plurality of source signals of said plurality of source lines at a predetermined level; and a voltage supply circuit, producing a first voltage and a second voltage in said display period, and said first voltage lower than said second voltage, said gate driving circuit generating said plurality of scan signals according to said first voltage and said second voltage; wherein while said source current-source is outputting said source current signal according to the levels of said plurality of source signals of said plurality of source lines, the output impedance of said source current-source is huge to increase the impedance of the electrical path transmitting said plurality of source signals.

10. The touch display driving circuit of claim 9, wherein a predetermined source voltage is provided to said plurality of source lines according to said source current signal outputted from said source current source according to the levels of said plurality of source signals of said plurality of source lines in said touch detection period; and said predetermined source voltage maintains the average value of the levels of said plurality of source signals of said plurality of source lines at said predetermined level.

11. The touch display driving circuit of claim 10, and further comprising a switching circuit, coupled between said source current-source and said plurality of source lines, and said source current-source providing said predetermined source voltage to said plurality of source lines via said switching circuit in said touch detection period.